[pre-commit.ci] pre-commit autoupdate (#325)
[pre-commit.ci] pre-commit autoupdate (#325)

updates:
- [github.com/psf/black: 20.8b1 → 21.4b0](https://github.com/psf/black/compare/20.8b1...21.4b0)

Co-authored-by: pre-commit-ci[bot] <3ea08453efb076ca910552532a53973a6527df40@users.noreply.github.com>
adamchainz/flake8-comprehensions